/*
 * Copyright (c) 2023, Alibaba Group Holding Limited;
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
#pragma once

#include <system_error>

namespace struct_pack {
enum class errc {
    ok = 0,
    no_buffer_space,
    invalid_buffer,
    hash_conflict,
    seek_failed,
};

namespace detail {

class struct_pack_category : public std::error_category {
public:
    virtual const char *name() const noexcept override {
        return "struct_pack::category";
    }

    virtual std::string message(int err_val) const override {
        switch (static_cast<errc>(err_val)) {
            case errc::ok:
                return "ok";
            case errc::no_buffer_space:
                return "no buffer space";
            case errc::invalid_buffer:
                return "invalid argument";
            case errc::hash_conflict:
                return "hash conflict";

            default:
                return "(unrecognized error)";
        }
    }
};

inline const std::error_category &category() {
    static struct_pack::detail::struct_pack_category instance;
    return instance;
}
} // namespace detail

} // namespace struct_pack